the heat of fusion of lead is 23.1 j/g. how much heat is absorbed as 85.0 g melt at
328°c?

Q = 1964 J

Explanation:

Data Given:

latent heat of fusion for Lead (Lf)= 23.1 J/g

amount of ice (mass) = 85.0 gram

heat required to melt lead (Q) =?

Solution:

Latent heat of fusion: the amount of heat that required to melt certain amount of a substance. The total heat absorbed by substance is proportional to the total heat of fusion of the material.

Formula Used

             Q = mLf

Q = heat required to melt a substance

m = mass of the substance

Lf =latent heat of fusion

put values in above formula

             Q = mLf

             Q = 85 g x 23.1 J/g

Q = 1964 J

that's what i got you can count the number of atoms

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.